Cambridge Pavers Home Additions & ADU Nationwide

Cambridge Pavers Home Additions & ADU: The Sunnyvale Owner’s Guide

Cambridge Pavers home additions and ADU construction in Sunnyvale typically runs $45,000-$130,000 for additions and $90,000-$220,000 for standalone ADUs, with written quotes delivered before any permit application or site work begins. We source Cambridge Pavers products through authorized distribution channels and install them per manufacturer spec, including the bedding layer, edge restraint, and permeable base details that determine whether the surface lasts 25 years or needs relaying in eight. Most Sunnyvale owners discover their paver installation is failing when settling creates trip hazards near the addition’s threshold, or when water pools against the new foundation instead of draining through the permeable joints Cambridge Pavers are designed for.

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Which Cambridge Pavers Models This Applies To

Cambridge Pavers produces several product lines relevant to home addition and ADU hardscaping in Sunnyvale: the ArmorTec line for driveways and heavy-use patios, the RoundTable series for permeable applications that meet Santa Clara County’s stormwater requirements, and the Olde English Cobble for walkways connecting the main residence to the new structure. The critical identification point is the paver thickness - ArmorTec runs 60mm for residential vehicular loads, while pedestrian-only applications may use 50mm units that cannot handle the delivery equipment during addition construction. We verify the original batch code, stamped on the pallet tags and sometimes visible on the paver chamfer, because Cambridge reformulated their base concrete mix in 2019 and the color match shifts slightly between production eras. OEM Cambridge Pavers ordered through their Livermore distribution center maintain exact color consistency; aftermarket equivalents from Belgard or Techo-Bloc, which we also stock, match closely but require a physical sample comparison under Sunnyvale’s afternoon light, which runs warmer than morning shade and changes how the aggregate reads.

Signs Your Cambridge Pavers Home Additions & ADU Is Failing

• Sinking or settling near the addition foundation. The compacted aggregate base, called the sub-base, was likely installed without adequate compaction lifts or the native soil wasn’t stripped of organic material. In Sunnyvale’s clay-heavy zones near Lakewood Village, that clay expands when wet and contracts in dry summers, pumping fines up through the bedding sand and creating voids the pavers drop into.
• Water pooling instead of draining through the joints. Cambridge’s permeable systems rely on open-graded aggregate and joint filler that allows infiltration. When homeowners or prior contractors seal the surface with an impermeant product, or when sediment clogs the joints, water sheets across and undermines the bedding layer. We’ve seen this after three consecutive dry winters when homeowners forget the system needs periodic joint refilling.
• Chipped corners or spalling surface. ArmorTec’s ceramic coating resists salt and freeze-thaw, but Sunnyvale’s rare hard freezes combined with calcium chloride from nearby concrete driveways can attack the exposed aggregate beneath. The damage starts at the chamfer and propagates inward; by the time it’s visible, the structural paver beneath is compromised.
• Weeds growing through the joints. This indicates the polymeric sand or joint stabilizer has washed out, which happens when edge restraints fail and the perimeter pavers migrate, opening gaps. The weed is a symptom; the cause is loss of interlock, meaning the pavement can no longer distribute loads across the full surface.
• Gaps opening between pavers and the addition’s stem wall or sliding door threshold. The original installation likely omitted an expansion joint against the structure, or the concrete footing settled independently from the paver base. Cambridge specifies a 1/2-inch flexible joint filled with backer rod and sealant; without it, thermal cycling cracks pavers or pushes them against the framing.

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Replacement Cost & What’s Included

Home addition and ADU projects involving Cambridge Pavers hardscaping in Sunnyvale fall within our $45,000-$130,000 range for attached additions and $90,000-$220,000 for detached ADUs, with the paver-specific portion typically representing 8-15% of the total. A standalone patio or walkway relay runs $3,500-$11,000 depending on square footage, access for excavation equipment, and whether we need to remove and replace the failed sub-base or can salvage it. The written quote itemizes: paver unit cost per square foot (Cambridge ArmorTec at $8-$14 installed versus equivalent Belgard or Techo-Bloc at $7-$12), excavation and disposal of failed material, imported Class II aggregate base at $45-$65 per ton with compaction in 6-inch lifts, bedding sand, edge restraint in aluminum or concrete, and labor. Under Clause 1 of The Haven Standard, that price is fixed once signed; no change order proceeds without your signature and a revised written total. Our 365-Day Done Right Promise covers the installation, and Cambridge’s limited lifetime warranty covers the paver itself against manufacturing defect.

DIY or Call Us?

An owner can safely check the paver model number against Cambridge’s online spec sheets and photograph the failure pattern for comparison, but relaying pavers over a failed base is not a weekend project. The sub-base requires plate compaction in controlled lifts to 95% Proctor density, a specification most rental compactors don’t achieve without moisture conditioning the aggregate. More critically, excavating against an existing addition foundation risks undermining the footing or damaging waterproofing, and in Sunnyvale’s expansive clay, improper drainage backfill can redirect water against the stem wall. We carry Cambridge Pavers-compatible edge restraints, bedding sand, and joint materials on our trucks, and our crews include a technician certified in ICPI (Interlocking Concrete Pavement Institute) installation standards. Call (650) 405-3637 to schedule your free estimate - we’ll measure it twice, write it down, then build it.

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